Vulnerability · Published Jun 11, 2026 · Assigned by GitLab
CVE-2026-8589Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in GitLab
High 7.3
In plain English
A high-severity cross-site scripting in GitLab from GitLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).
Severity (CVSS 3.1)7.3High
Exploit odds (30 days)0.3%top 82.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
GitLab has remediated an issue in GitLab EE affecting all versions from 13.1.4 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2 that under certain conditions could have allowed an authenticated user to add unauthorized email addresses to a targeted user's account due to improper sanitization of user-supplied input in certain group setting fields.
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:N
References
- https://gitlab.com/gitlab-org/gitlab/-/work_items/600099
- HackerOne Bug Bounty Report #3722842 technical-description, exploit, permissions-required
- https://about.gitlab.com/releases/2026/06/10/patch-release-gitlab-19-0-2-released/